We present systematic studies of the electromagnetic interference (EMI) shielding and microwave properties of a new class of shielding material, i.e., the ferromagnetic microwires-embedded polymer composites. We show that at 1–2 GHz the shielding effectiveness (SE) of the continuous-wire composite reaches a high value of 18 dB (98.4% attenuation) for a very low filler loading of 0.024% and a thickness of 0.64 mm. The normalized SE of this new composite is about 70 times higher than that of the bucky paper-based composite and is two to four orders of magnitude higher than those of other shielding candidate materials. Complex permeability, permittivity, and impedance experiments reveal that the absorption of electromagnetic radiation is a dominant mechanism for EMI shielding of the studied composites. The advantages of high shielding efficiency, good physical integrity, low fabrication costs, and multifunctionalities make them an attractive candidate material for a variety of technological applications.

We report the results of a systematic study of the magnetic, mechanical, magnetoimpedance and field tunable properties of glass-coated amorphous ${\text{Co}}_{68.7}{\text{Fe}}_4{\text{Ni}}_1{\text{B}}_{13}{\text{Si}}_{11}{\text{Mo}}_{2.3}$ microwires and composites containing these microwires. The magnetic microwires possess good magnetic and mechanical properties. The magnetoimpedance ratio in the gigahertz range varies sensitively with applied fields below the anisotropy field but becomes unchanged for higher applied fields. The good mechanical properties are retained in the magnetic microwires-embedded composites. The strong field dependences of the effective permittivity and transmission parameters in the gigahertz range indicate that the present composites are very promising candidate materials for structural health monitoring and self-sensing applications.

The magnetic anisotropy and magnetostriction of a Lu2Fe17 single crystal are investigated. The temperature dependence of the magnetic anisotropy constant K1 is measured in the range 4.2–300 K. The res

We present a study of the hydrogenation effect on structural and magnetic properties of ${\mathrm{HoFe}}_{11}\mathrm{Ti}$ single crystal. Single crystal hydride ${\mathrm{HoFe}}_{11}{\mathrm{TiH}}_X$ with H concentration $x=1\mathrm{}$ at. H/f.u. has been prepared. Magnetization measurements along the main symmetry directions of the tetragonal structure have been performed on ${\mathrm{HoFe}}_{11}{\mathrm{TiH}}_x$ $\mathrm{}(x=0,1\mathrm{})\mathrm{}$ single crystals at applied high magnetic fields up to 80 kOe in the temperature range from 4.2 to 300 K. Torque measurements were carried out in the temperature range 78–700 K in magnetic fields up to 13 kOe. The single-ion magnetic exchange and crystalline-electric-field interaction model has been applied to the fitting of the experimental behavior of the single-crystal ${\mathrm{HoFe}}_{11}{\mathrm{TiH}}_x$ $\mathrm{}(x=0,1\mathrm{})\mathrm{}$ samples. A set of CEF parameters and mean exchange field has been obtained. Hydrogen atoms have been found to have a significant effect on the second-order crystal field parameter $A_2^0$ ${(A}_2^0=-20.5$ ${\mathrm{Ka}}_0^{-2}$ for ${\mathrm{HoFe}}_{11}\mathrm{Ti}$ and $A_2^0=-118$ ${\mathrm{Ka}}_0^{-2}$ for ${\mathrm{HoFe}}_{11}\mathrm{TiH}).\mathrm{}$